kernel/drivers/clk/tegra/clk-tegra-super-gen4.c

   1 /*
   2  * Copyright (c) 2012, 2013, NVIDIA CORPORATION.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16
  17 #include <linux/io.h>
  18 #include <linux/clk.h>
  19 #include <linux/clk-provider.h>
  20 #include <linux/of.h>
  21 #include <linux/of_address.h>
  22 #include <linux/delay.h>
  23 #include <linux/export.h>
  24 #include <linux/clk/tegra.h>
  25
  26 #include "clk.h"
  27 #include "clk-id.h"
  28
  29 #define PLLX_BASE 0xe0
  30 #define PLLX_MISC 0xe4
  31 #define PLLX_MISC2 0x514
  32 #define PLLX_MISC3 0x518
  33
  34 #define CCLKG_BURST_POLICY 0x368
  35 #define CCLKLP_BURST_POLICY 0x370
  36 #define SCLK_BURST_POLICY 0x028
  37 #define SYSTEM_CLK_RATE 0x030
  38
  39 static DEFINE_SPINLOCK(sysrate_lock);
  40
  41 static const char *sclk_parents[] = { "clk_m", "pll_c_out1", "pll_p_out4",
  42                                "pll_p", "pll_p_out2", "unused",
  43                                "clk_32k", "pll_m_out1" };
  44
  45 static const char *cclk_g_parents[] = { "clk_m", "pll_c", "clk_32k", "pll_m",
  46                                         "pll_p", "pll_p_out4", "unused",
  47                                         "unused", "pll_x" };
  48
  49 static const char *cclk_lp_parents[] = { "clk_m", "pll_c", "clk_32k", "pll_m",
  50                                          "pll_p", "pll_p_out4", "unused",
  51                                          "unused", "pll_x", "pll_x_out0" };
  52
  53 static void __init tegra_sclk_init(void __iomem *clk_base,
  54                                 struct tegra_clk *tegra_clks)
  55 {
  56         struct clk *clk;
  57         struct clk **dt_clk;
  58
  59         /* SCLK */
  60         dt_clk = tegra_lookup_dt_id(tegra_clk_sclk, tegra_clks);
  61         if (dt_clk) {
  62                 clk = tegra_clk_register_super_mux("sclk", sclk_parents,
  63                                                 ARRAY_SIZE(sclk_parents),
  64                                                 CLK_SET_RATE_PARENT,
  65                                                 clk_base + SCLK_BURST_POLICY,
  66                                                 0, 4, 0, 0, NULL);
  67                 *dt_clk = clk;
  68         }
  69
  70         /* HCLK */
  71         dt_clk = tegra_lookup_dt_id(tegra_clk_hclk, tegra_clks);
  72         if (dt_clk) {
  73                 clk = clk_register_divider(NULL, "hclk_div", "sclk", 0,
  74                                    clk_base + SYSTEM_CLK_RATE, 4, 2, 0,
  75                                    &sysrate_lock);
  76                 clk = clk_register_gate(NULL, "hclk", "hclk_div",
  77                                 CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED,
  78                                 clk_base + SYSTEM_CLK_RATE,
  79                                 7, CLK_GATE_SET_TO_DISABLE, &sysrate_lock);
  80                 *dt_clk = clk;
  81         }
  82
  83         /* PCLK */
  84         dt_clk = tegra_lookup_dt_id(tegra_clk_pclk, tegra_clks);
  85         if (!dt_clk)
  86                 return;
  87
  88         clk = clk_register_divider(NULL, "pclk_div", "hclk", 0,
  89                                    clk_base + SYSTEM_CLK_RATE, 0, 2, 0,
  90                                    &sysrate_lock);
  91         clk = clk_register_gate(NULL, "pclk", "pclk_div", CLK_SET_RATE_PARENT |
  92                                 CLK_IGNORE_UNUSED, clk_base + SYSTEM_CLK_RATE,
  93                                 3, CLK_GATE_SET_TO_DISABLE, &sysrate_lock);
  94         *dt_clk = clk;
  95 }
  96
  97 void __init tegra_super_clk_gen4_init(void __iomem *clk_base,
  98                                 void __iomem *pmc_base,
  99                                 struct tegra_clk *tegra_clks,
 100                                 struct tegra_clk_pll_params *params)
 101 {
 102         struct clk *clk;
 103         struct clk **dt_clk;
 104
 105         /* CCLKG */
 106         dt_clk = tegra_lookup_dt_id(tegra_clk_cclk_g, tegra_clks);
 107         if (dt_clk) {
 108                 clk = tegra_clk_register_super_mux("cclk_g", cclk_g_parents,
 109                                         ARRAY_SIZE(cclk_g_parents),
 110                                         CLK_SET_RATE_PARENT,
 111                                         clk_base + CCLKG_BURST_POLICY,
 112                                         0, 4, 0, 0, NULL);
 113                 *dt_clk = clk;
 114         }
 115
 116         /* CCLKLP */
 117         dt_clk = tegra_lookup_dt_id(tegra_clk_cclk_lp, tegra_clks);
 118         if (dt_clk) {
 119                 clk = tegra_clk_register_super_mux("cclk_lp", cclk_lp_parents,
 120                                         ARRAY_SIZE(cclk_lp_parents),
 121                                         CLK_SET_RATE_PARENT,
 122                                         clk_base + CCLKLP_BURST_POLICY,
 123                                         TEGRA_DIVIDER_2, 4, 8, 9, NULL);
 124                 *dt_clk = clk;
 125         }
 126
 127         tegra_sclk_init(clk_base, tegra_clks);
 128
 129 #if defined(CONFIG_ARCH_TEGRA_114_SOC) || defined(CONFIG_ARCH_TEGRA_124_SOC)
 130         /* PLLX */
 131         dt_clk = tegra_lookup_dt_id(tegra_clk_pll_x, tegra_clks);
 132         if (!dt_clk)
 133                 return;
 134
 135         clk = tegra_clk_register_pllxc("pll_x", "pll_ref", clk_base,
 136                         pmc_base, CLK_IGNORE_UNUSED, params, NULL);
 137         *dt_clk = clk;
 138
 139         /* PLLX_OUT0 */
 140
 141         dt_clk = tegra_lookup_dt_id(tegra_clk_pll_x_out0, tegra_clks);
 142         if (!dt_clk)
 143                 return;
 144         clk = clk_register_fixed_factor(NULL, "pll_x_out0", "pll_x",
 145                                         CLK_SET_RATE_PARENT, 1, 2);
 146         *dt_clk = clk;
 147 #endif
 148 }
 149